I made a Hammy style putter long before the patent later acquired by the company in Chicago. Ended up sending information, pics, ets., to an attorney representing the company when I began to market my putter of this style on ebay. They with drew their complaint to ebay and I sold a lot of putters in the years that followed. My shaft was similar in lie angle, but I also had some slight differences in my set up. However, this style is most effective when you anchor the lead arm to your side. The "anchoring" rule took this style of putter down in the market place. However, it still is very effective if you move your lead elbow out away from your body, in line with the line you want to start your ball rolling on and use a stroke that represent a baseball "bunt." You have to stabilize the lead side of your stroke.
I built my putter around 1980 because I am blind in my left eye and right handed. It was a work in progress for several years before I settled on a specific lie angle, putter head style, and grip. It works very well if you need to open your stance because you need to open your stance to best see the line. So it is an excellent design for a golfer whose dominant eye is not on their lead side or someone such as myself that has poor or no eyesight on their lead side.
I actually had a couple of pro's on some of the various circuits try my putter and play it in competition. None were PGA, but in some the circuits in Florida, etc. I also sold a bunch to teaching pros because it was very helpful in teaching certain aspects of conventional putting. This was also true of the belly putter which I also built to market, but never personally used personally when I played.
